GHSA-2r3x-4mrv-mcxf

Suggest an improvement
Source
https://github.com/advisories/GHSA-2r3x-4mrv-mcxf
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-2r3x-4mrv-mcxf/GHSA-2r3x-4mrv-mcxf.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-2r3x-4mrv-mcxf
Published
2026-10-06T15:22:29Z
Modified
2026-10-06T15:30:03Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Vyper: Memory corruption using function calls within tuples / nested calls
Details

Impact

When performing a function call inside a tuple or as an argument inside another function call, there is a memory corruption issue that occurs because of an incorrect pointer to the the tip of the stack.

Example code:

@internal
def _foo(a: uint256, b: uint256, c: uint256) -> (uint256, uint256, uint256, uint256, uint256):
    return 1, a, b, c, 5

@internal
def _foo2() -> uint256:
    a: uint256[10] = [6,7,8,9,10,11,12,13,15,16]
    return 4

@external
def foo() -> (uint256, uint256, uint256, uint256, uint256):
    return self._foo(2, 3, self._foo2())

Please see #2186 for further information

Patches

This problem was fixed in #2186, and released as a part of v0.2.6.

Database specific 
{
    "cwe_ids": [
        "CWE-129"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-06T15:22:29Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
}
References

Affected packages

PyPI / vyper

Package

Name
vyper
View open source insights on deps.dev
Purl
pkg:pypi/vyper

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.2.6

Affected versions

0.*
0.1.0b1
0.1.0b2
0.1.0b3
0.1.0b4
0.1.0b5
0.1.0b6
0.1.0b7
0.1.0b8
0.1.0b9
0.1.0b10
0.1.0b11
0.1.0b12
0.1.0b13
0.1.0b14
0.1.0b15
0.1.0b16
0.1.0b17
0.2.1
0.2.2
0.2.3
0.2.4
0.2.5

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-2r3x-4mrv-mcxf/GHSA-2r3x-4mrv-mcxf.json"